yeah but goodsy, should you use your left hand or right hand to hold the toothbrush, surely there must be a way to brush correctly to reduce the risk of a heart attack?
but how long should you be in the baby walker for, while brushing your teeth, when you have had not enough sleep, should you start to worry about taking time off work in case of a heart attack? ;-)
It all depends on what the person is wearing while using the brush and the weight of their clothes therefore reducing or improving their brushing technique. Also if there is a prevailing wind then small particles of toothpaste may go astray thus not removing the plaque as much. Therefore the answer is fourteen and a half minutes unless it is a leap year.